$ git clone -n https://src.fedoraproject.org/rpms/golang-github-alecthomas-repr.git /var/lib/mock/f45-build-11720-434/root/chroot_tmpdir/scmroot/golang-github-alecthomas-repr
Cloning into '/var/lib/mock/f45-build-11720-434/root/chroot_tmpdir/scmroot/golang-github-alecthomas-repr'...
$ git fetch origin 576cebc54f846fd11f1144611741284c876f65aa:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-alecthomas-repr
 * [new ref]         576cebc54f846fd11f1144611741284c876f65aa -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 576cebc Update to 0.5.4 upstream release